06-23-2016, 07:35 PM
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#12 (permalink)
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Track Member
Join Date: Mar 2016
Location: San jose
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Drives: 2013 370z sport
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Quote:
Originally Posted by SouthArk370Z
I don't think the car would run right if ECM was getting a bad signal or computing a bogus value. But it's easy enough to check and OP is going to want a reader before this project is over (IIRC, all gauges, except clock in triple-gauge get their data over OBD/CAN) so why not?
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Correct, therefore if all other cluster functions are operating correctly (lights, gauges, speedo, etc) then you can rule out a bad connection. It's not like your old car where your tach is connected to the ignition coil neg terminal or receiving a direct signal from a ignition control module. It is getting its data on the same comm lines as all the rest of the data, which would mean there is an internal issue with the tach and that is not serviceable (or at least none I have ever seen are).
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